Driving mechanism for kinematograph apparatus.



0. E0881. DRIVING MECHANISM FOR KINEMATOGRAPH'APPARATUST APPLICATIONFILED JUNE 5, 1908.

935,167, Patented Sept.28,1909,

Fig.1 I Fig.2

TES PATEN CARLO ROSSI, or TURIN, ITALY.

DRIVING MECHANISM FOR KINEMATOGRAPH APPARATUS.

"To all whom it may concern."

Be it known that 1, Clinic ROSSI, a sub-' jcct of the King of Italy,residing at Turin,

ltaly, have invented a certain new and useful improved Driving Mechanismfor Kinematograph Apparatus, of which the following is a specification.

V It is well known that in kineinatograph and like apparatus, it isnecessary to bring about an intermittent driving of the band. or film,and that this can be obtained by means of reciprocating movement of twoclaws or the like engaging, during their operative travel, perforationsin the edges of the film. i

Tliis iniention relates to a mechanism for driving a band or a film, andis particularly applicable to use in connection with any kind ofkinematograph apparatus used,

proyecting or for exposing the either for which has special advantagesas regards the uniformity and precision of the movement as well .as thewear of the edges of the perforations;

ii. construction of mechanism according to this inyention'ls illustratedby way of example 'in' the accompanying drawing in which Figure 1 is aside elevation, Fig. 2 a front.

elevationand Fig. 3 aplan. Fig. 4 shows the path followed by the pointsof the claws.

On a plate 1 provided with a groove 2 of rectangular cross-section inwhich the band 'or the film moves is mounted by means of abracket 3, aspindle 4 driven in any suitable manner. to which is keyed thecrank-disk 5 controlling the connecting rod 6. The other end of theconnecting rod is pivoted on a frame T' which is horizontally movablebe-; ftweein guides This frame is provided in the center with a slot 9of the shape shown there-mgr) be two, three orfour pairs in stead ofone, are also secured to the twoends of a cross-bar 18, secured to apart 19 having the. shape of'a bend, the spindle 20 of whichSpecification of Letters Patent.

helical spring 27, for the ducmg constant motion and allowing for thecorresponding Patented Sept. 28, 1909'.

Application filed June 5,1908. Serial No. 436,947.

can slide in the bifurcated end 21 of a lever 22 pivoted to the supportor bracket 3, the

other end of the said lever carrying ahead or roller 23 engaging in thecam groove 24 60 inthe rim of the cranl-z-disk 5 (Fig. 3). In line withthe tail 1st ofthe part 12 is mounteda stop held raised in its guide 26by a purpose of prowear of the difierent parts, when the end- 0f thetail ltcoines into contact with the stop. The working of the mechanismwill loe readily understoodfrom the above descripfl The drawing showsthe frame 7 and-the tion.

part 12 in their central positions. If thecrank-disk 5 is rotated in thedirection of the arrow (Fig. 2), the frame 7 will be moved toward theright by the connecting rod 6,

and the slot 9 will bring about the lowering of the head 11 andconsequently of the part 12. As the extensions 16 guiding the claws 17are secured to the part- 12, the claws are thus moved. When the head Hisopposite the end of the inclined portion lof the-'slot- 9, the part 12will withdraw a little un'de'rthe action of the projection 10andfwliilefltlije head 11 slides in that portion of 'the'slot which isparallel to the axis of the movement.

of the frame 7 (and when consequently the part 12 remains stationary),thehead 23 of the lever 22 is opposite the inclined portions of thegroove 24:; On further turning the crank-disk 5, the lever 22 will beoscillated,

and its bifurcated end will move back the spindle 20, and with thelatter the part 19, the crossbar 1S and the claws 17 which in that wayare withdrawn in theinterior from the groove in which they travel, thusreleasing the film.

Owing to the projection or boss 10 on the wall of the slot 9. and to thewithdrawal of the part 12 resulting therefrom, when the claws 17 becomewithdrawn froni the ration of the film, they are not atthe endi of theirstroke, the result of which is that all friction on the edges of theperforations: which is the chief cause of their wearing out;

is avoided. The further rotation of the 105 crank-disk 5 results in themoving of the frame 7 towardthe left and consequently in the raising ofthe part 12, the claws 17 held in the interior of the late being at thesame -time raised owing to t e position of ahe lever 11 0 22. When theclaws have reached the end of the return stroke, they are pushedforwa'rd perfoso as to project outside the plate, by means of the lever22, the head 23 of'which' engages with another inclined portion of thegroove 24. The claws 17 engage then with other perforations of the filmand begin another driving motion. The movement of the point'ofthe claws17 is shown for the sake of clearness, in dotted lines in Fig. 4. Itdescends from ato 1), moves back a littleto r, then rises to d andreturns to a.

For-the purpose of doing away with the influence of play due to, thewearing of the parts, which would affect the, length of travel, there isarranged a' spring" controlled part .travel and consequently reduces thewhole light, and thus to obtain clearer views. In v the constructionshown. in the accompanying disk 5 makes a complete revolution,

stop 25 which pushes back the'tail 14 of the 12 as soon as it reachesthe end of its play to one side. Such amechanism brings about a uniformdriving of the film and. does away with any causes of injury toitsperforations, for the, transmission of movement from the crank-disk?) tothe frame 7 by means of' the connecting rod 6,.thespeed of travel ofthe'frame 7 as well as that of the part 12 and of the claws varies inaccordance with a sinusoidal dia-" gram, so that the moment the clawshave engaged with the perforations, they do not drive the film suddenlybut first advance at a reduced speed" which gradually increases until itreaches the maximum atthe' center of the travel, after which it againdecreases until it becomes zero at th end of the stroke.

The method of transmitting movement to the part-12 by'means of the slot9 makes it possible to change, by changing the inclina-. tion of theslot, the time occupied by the travel of the claws relatively to thetime .occupied by a complete movement, so that in an apparatusintended'for projecting photographs, it is possible, by reducing theinclination of the slot relatively to the vertical axis, to increase theduration of exposure to drawing, the descent-of the part12 takes'aquarter of the time during whichthe crankbut it will be understood thatby reducing the inclination of the slot relatively to theaxis of thepart 12, it is possible to make the travel of the part to last say onlyone-sixth,

one-seventh or one-eighth of thetime 'required by the disk 5 for makinga complete revolution. In that case, itwill be naturally necessary .tomodify the cam groove in the by the grooved rim of the crank-disk 5,sothat the claws should be brought into engagement with the perforationsof the film, and withdrawn therefrom at the desired periods.

What I claim as my invention and desire to secure by Letters Patentis 1. An intermittent driving mechanism for a band or film, comprising acrank-disk and a transverse frame, a connecting'rod between thecrank-disk and the frame, a plate intermittently. raised and lowered bythe frame, claws carried by said plate for engaging the band and meansfor causing the" claws to periodically enga e with and move the band,and disengage t erefrom.

2. An intermittent driving mechanism for a band or film comprising acrank-disk, areciprocating frame having a central inclined slot therein,a connecting rod between the crank-disk and the frame, aplate'intermittently raised and lowered by the frame, and

claws carried by said plate for engaging theband.

.3. An intermittent driving mechanism for a band or film comprising acrank-disk and a transverse frame, a connecting rod between thecranledisk and the frame, aplatc intermittently raised and lowered bythe frame, claws carried by said p gaging the claws to periodicallyengage with and move the band, and disengage therefrom, and a late forenspring-controlled stop, operating as described.

4. An intermittent driving mechanism for a band or filmcomprising acrank-disk having a cam groove therein, a rod connected to saidcrank-disk, a frame reciprocated by said rod and having a centralinclined slottherein, a projection on that portion of the frame formingone wall of said slot and ad jacent one end of the latter, a headengaging said slot, a plate carrying said head and mounted toreciprocate in guides, claws mounted on the'plate, and'means controlledcrank-disk for eii'ecting the band,means for causing the engagement anddisengagement ofthe claws with and from the band periodically.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

, CARLO nossi.

' Witnesses: CARno ANTON IN G,

Lotus I\LBANI.

